Imaging in shot-geophone space

SURVEY SINKING WITH THE DSR EQUATION

Exploding-reflector imaging will be replaced by a broader imaging concept, survey sinking. A new equation called the double-square-root (DSR) equation will be developed to implement survey-sinking imaging. The function of the DSR equation is to downward continue an entire seismic survey, not just the geophones but also the shots. Peek ahead at equation (9.13) and you will see an equation with two square roots. One represents the cosine of the wave arrival angle. The other represents the takeoff angle at the shot. One cosine is expressed in terms of $k_g$, the Fourier component along the geophone axis of the data volume in $(s,g,t)$-space. The other cosine, with $k_s$, is the Fourier component along the shot axis.